Comprehensive digital mid-frequency receiving system for TCAS and S-mode responser

Abstract

A comprehensive digital mid-frequency receiving system for a TCAS (Traffic Collision Avoidance System) and an S-mode responser comprises a digital down converting module, a TCAS baseband pre-processing module and an S-mode responser baseband pre-processing module, wherein the output terminal of the digital down converting module is connected with the input terminals of both the TCAS baseband pre-processing module and the S-mode responser baseband pre-processing module respectively through signal wires. The realization process comprises the following steps: four sampled mid-frequency digital signals are subjected to unified digital down conversion; b, a TCAS baseband pre-processing passage and an S-mode responser baseband pre-processing passage are separated through information such as radio frequency difference between the TCAS and the S-mode responser, difference between antenna receiving passages and the like; and c, digital signal processing are performed on the two baseband modules respectively, so as to complete inquiry of A / C / S mode, as well as separation, extraction and decoding of answer signals. The comprehensive digital mid-frequency receiving system has the advantages of high speed, flexibility, easiness in maintenance and expansion and the like, and plays an important role of lowering the airplane life cycle cost.

Description

technical field [0001] The present invention relates to electronic communication, specifically an air traffic warning and collision avoidance system (Traffic Collision Avoidance System, hereinafter referred to as TCAS) based on a Field Programmable Logic Array (Field Programmable Gate Array, hereinafter referred to as FPGA) and an S-mode transponder. Integrated digital intermediate frequency receiving system. Background technique [0002] At present, there is no domestic research and design on the integration of air traffic warning and collision avoidance system (abbreviated as: TCAS) and S-mode transponder, while foreign systems are at most formally combined integrated systems, which have not achieved comprehensive integration. That is, platform sharing, software and hardware resource sharing, information fusion, function integration, etc. Moreover, the TCASII system, which is widely used in various types of aircraft today, is also based on the independent TCAS and Mode S ...

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Problems solved by technology

[0003] It can be seen from the above-mentioned research status that the current development of TCAS and S-mode transponders mainly has the following two deficiencies: on the one hand, the TCAS and S-mode transponders of this machine use their own independent antenna system, RF front-end circuit and processing module, etc. To send and receive radio signals and do corresponding processing, to some extent, it will cause a waste of resources on an aircraft equipped with TCAS and Mode S transponders at the same time, which not only increases the burden on the crew, but also makes the aircraft Spare parts inventory increases, aircraft weight increases, and maintainability decreases, which is not conducive to reducing aircraft life cycle costs, etc.; The future upgrade and maintenance of the equipment will bring some obstacles, and it is not easy to expand

[0006] However, none of the existing technologies can carry out the research and design of the avionics system from an integrated point of view, and the former also fails to use software radio technology in the entire design

These have resulted in heavy spare parts warehouses for airborne equipment, waste of resources, difficulty in upgrading and maintenance, etc.

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